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I have 2 bird meters. One has a aftermarket PEP. The second is a true bird 43P. The true 43P shows 2 or 3 more  watts than the add on kit.  I am talking Diawa showing about 20W less power. On my 100W radio. I also compaired it to a LP100A. And it was also unacceptable. I will end up sending it back for  recalibration.  I love the size of the meter and ease of seeing the SWR at a glance. But I must say a bit disappointing.